Vapor density refers to the density of a vapor, in units such as g/m^3 or kg/m^3. Since you don't indicate any units, I think it means something different here. I found this URL:http://www.trconsultinggroup.com/safety/oct2001.html
According to that convention, your solution would produce a vapor with a density 1.3 times that of air. What IS the solution? Do you know?